The Doctrine of Non-Intervention bars States from coercively interfering in the internal or external affairs of other States—especially through force, armed support, or political coercion.

Anchored in Article 2(4) of the UN Charter, it protects sovereignty and political independence. While diplomacy and lawful collective action exist, unilateral interference—direct or indirect—crosses the line.

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High-yield in Public International Law. Frequently tested with use of force vs. non-intervention, proxy warfare, support to rebels, and the trap that “indirect” assistance (funding, training, arming) is permissible—it isn’t.

Military and Paramilitary Activities in and against Nicaragua

(Nicaragua v. United States), ICJ Reports 1986.

Nicaragua challenged U.S. support for the Contras and operations affecting its territory. The ICJ held that arming, training, and financing rebel forces constitutes unlawful intervention and violates the prohibition on the use of force and non-intervention, even without a formal declaration of war.

🥜 Backing rebels—directly or indirectly—breaches non-intervention and the ban on force; coercion by proxy is still illegal.